i talk about the librarian in alexandria, egypt, for instance. i hope i am not mangling his name to badly. roughly measure the world with not much more than, you know, a calendar and the sun and the big stick in the ground. and when you see that extraordinary sense of developing knowledge about the natural world, that comes out of your curiosity, that is what i think i'm talking about when i talk about kids natural curiosity and how we have to keep telling the stories to fire up their imagination and creativity. >> host: zero contrarian tweet sent to you, these days history class is tend to focus almost exclusively on the underrepresented groups mentioned. do we spend -- are we to eurocentric? to spend too much time on the magellan and columbus? >> tina, that's a good question. i think it has been somewhat addressed. some people think that it has swung too far. i know, for instance, there were some concerns a few years ago that there were history standards coming out that did not mention robert e. lee. on the other hand, there are the texas state